瑕疵履行是指单纯造成履行利益受损害的（）行为。
A.不完全履行
B.拒绝履行
C.迟延履行
D.预期违约
参考答案：A
用所给词的适当形式填空
1. She doesn't want _________(help) you at all.
2. Let's_________(look)at this map.
3. It ___________(take) me two hours to finish my homework every day.
4. It's necessary for me _________(wash) my clothes.
5. Please__________(tell) him _______(come) to the hospital.
氧在高温时非常活泼，能氧化许多金属，这表明氧具有（）。
A.很强的非金属性
B.很强的金属性
